The W205 C 63 S uses a 4.0-liter twin-turbo V8 related to the Mercedes-AMG GT's, rated at 503 horsepower and 516 lb-ft. Mercedes claims the downsized engine uses 32 percent less fuel than the car it replaced. A seven-speed automatic drives the rear wheels, with three-stage adaptive dampers and 390 mm front discs. You're looking at a 2015 C 63 S sedan in designo Selenite Grey Magno, a matte finish.